Biometric Identification Using Light Filtering Module
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Solution Overview
Problem
Conventional biometric identification systems using photodetection devices with semiconductor materials suffer from interference from environmental visible light, low signal-to-noise ratio, and optical distortion, which affects the accuracy of fingerprint identification due to the structure and design of the photodetection display apparatus.
Innovation Solution
A biometric identification apparatus comprising a light-transmissible plate, a light filtering module, and a photodetection member, where the light filtering module filters reflected light to select a specific angle range for the photodetection member, enhancing the accuracy of detecting physiological characteristics by reducing interference and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photodetection devices with semiconductor materials are used, then the device can detect optical signals, but environmental visible light causes interference and reduces signal-to-noise ratio
Solution Approach 1:
The patent converts the harmful effect of environmental visible light into a beneficial filtering mechanism. By using a light filtering module that selectively blocks visible light wavelengths while allowing other wavelengths to pass, the system transforms the interference problem into a solution where the filtering process itself enhances signal quality. The filtering module uses the properties of light interaction with materials to achieve wavelength-selective transmission, turning the presence of environmental light from a harmful factor into an opportunity for demonstrating selective optical filtering.
2Adaptability or versatility
If photodetection devices are integrated with display apparatus, then photodetection function is added, but optical distortion occurs due to pixel aperture ratio limitations
Solution Approach 1:
The patent introduces a light filtering module as an intermediary component between the display apparatus and the photodetection device. This intermediary layer performs optical signal processing by filtering out unwanted wavelengths and directions of light before they reach the photodetection elements. The filtering module acts as a mediator that corrects optical distortion caused by the pixel aperture structure, enabling the integrated system to maintain both display and photodetection functions with high precision.
3Measurement precision
If incident light passes through multiple layers of display apparatus, then photodetection function is achieved, but useful optical signals are difficult to abstract from environmental signals
Solution Approach 1:
The patent employs parameter changes in the optical filtering process to enhance signal abstraction. The light filtering module is designed with specific optical parameters (wavelength selectivity, transmission angles, filtering efficiency) that are optimized to differentiate between useful optical signals and environmental noise. By adjusting and optimizing these optical parameters, the system achieves high-fidelity signal extraction despite the complexity of multiple layered structures in the display apparatus.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves the accuracy of detecting physiological characteristics by filtering out unwanted light angles, thereby increasing the intensity and clarity of the optical signals received by the photodetection member, leading to more precise identification of fingerprints and other biometric features.
Implementation Method 1
the light filtering module is configured to filter the original reflected light to obtain a light with a traveling direction in a predetermined angle range
Implementation Method 2
the display member is configured to emit light
Implementation Method 3
the light is reflected off of a surface of the light-transmissible plate to form an original reflected light
Implementation Method 4
the photodetection member is configured to receive the light filtered by the light filtering module
Data Source
AI summary
A biometric identification apparatus is provided to include a light-transmissible plate, a light filtering module, a display member and a photodetection member. The display member is configured to emit light, and the light is reflected by a surface of the light-transmissible plate and formed as an original reflected light. The light filtering module is configured to filter the original reflected light to obtain a light with a traveling direction in a predetermined angle range, and the photodetection member is configured to receive the light filtered by the light filtering module.